Laguna Beach
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Laguna Beach clear sky chart from 2005-11-06 to 2024-01-12.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
71%
24622
30%
74129
28%
24570
73%
24570
40%
41207

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 10thNight
69%
757
29%
2457
29%
756
72%
756
40%
1286
January11th to 20thNight
71%
728
36%
2226
33%
728
76%
728
43%
1166
January21st to endNight
64%
792
35%
2376
31%
792
70%
792
41%
1284
February1st to 10thNight
69%
720
35%
2160
35%
720
74%
720
44%
1125
February11th to 20thNight
65%
700
32%
2098
31%
700
71%
700
40%
1155
February21st to endNight
63%
592
28%
1776
29%
592
67%
592
35%
1035
March1st to 10thNight
62%
720
24%
2160
25%
720
67%
720
35%
1254
March11th to 20thNight
65%
720
24%
2116
25%
720
68%
720
36%
1241
March21st to endNight
69%
792
29%
1987
22%
792
73%
792
44%
1191
April1st to 10thNight
66%
720
27%
1800
19%
720
67%
720
39%
1129
April11th to 20thNight
66%
711
30%
1779
20%
711
69%
711
45%
1046
April21st to endNight
69%
720
26%
1800
16%
720
70%
720
41%
1119
May1st to 10thNight
66%
653
23%
1733
15%
653
67%
653
36%
1090
May11th to 20thNight
63%
531
21%
1595
18%
531
64%
531
30%
1021
May21st to endNight
66%
582
23%
1746
18%
582
67%
582
33%
1081
June1st to 10thNight
59%
540
17%
1620
14%
540
60%
540
25%
1115
June11th to 20thNight
70%
481
26%
1561
24%
481
70%
481
34%
897
June21st to endNight
66%
360
24%
1440
30%
360
66%
360
27%
800
July1st to 10thNight
69%
350
26%
1400
31%
350
69%
350
30%
734
July11th to 20thNight
80%
488
27%
1532
24%
488
80%
488
41%
825
July21st to endNight
77%
752
25%
1827
19%
711
77%
711
46%
1069
August1st to 10thNight
79%
716
29%
1780
19%
712
79%
712
50%
1012
August11th to 20thNight
79%
712
33%
1780
22%
712
79%
712
53%
991
August21st to endNight
81%
792
34%
1980
24%
792
81%
792
53%
1092
September1st to 10thNight
79%
720
34%
1800
27%
720
79%
720
51%
1020
September11th to 20thNight
81%
720
37%
1952
35%
720
82%
720
53%
1008
September21st to endNight
80%
720
38%
1980
38%
720
81%
720
55%
996
October1st to 10thNight
81%
720
35%
1980
34%
720
82%
720
54%
1010
October11th to 20thNight
76%
720
37%
2047
38%
720
77%
720
49%
1063
October21st to endNight
78%
792
39%
2425
41%
792
80%
792
50%
1170
November1st to 10thNight
76%
740
34%
2405
37%
740
79%
740
48%
1134
November11th to 20thNight
80%
760
37%
2470
42%
760
83%
760
50%
1165
November21st to endNight
70%
760
32%
2470
34%
760
72%
760
39%
1293
December1st to 10thNight
68%
760
30%
2470
30%
760
71%
760
36%
1331
December11th to 20thNight
64%
758
29%
2962
32%
758
69%
758
27%
1764
December21st to endNight
62%
823
20%
4439
29%
817
68%
817
21%
2495

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
5%42332345%8%60%
75251
Night
7%7%24424447%54%
74498
TransparencyDay
23%47%20%25%21%
74981
Night
29%46%17%22%23%
74291
SeeingDay
6%416%35%30%9%
14652
Night
8%27%29%39%14%
24646

By Month

Percentage Cloud Cover SW (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
8%42442345%10%52%
1708
11th to 20thDay
7%42432445%6%59%
1768
21st to endDay
9%5%24322345%59%
1980
February1st to 10thDay
8%424324447%59%
1800
11th to 20thDay
7%32432335%9%59%
1750
21st to endDay
8%424424446%58%
1480
March1st to 10thDay
6%5%235%36%5%6%8%52%
1800
11th to 20thDay
7%42342336%12%54%
1844
21st to endDay
5%3133245%6%8%60%
2366
April1st to 10thDay
5%42332446%9%57%
2160
11th to 20thDay
3424423447%64%
2129
21st to endDay
432232345%9%63%
2160
May1st to 10thDay
5%42442446%10%56%
2224
11th to 20thDay
5%6%24313449%59%
2301
21st to endDay
6%6%2432345%8%56%
2530
June1st to 10thDay
7%7%25%42345%11%51%
2340
11th to 20thDay
442332345%9%61%
2390
21st to endDay
35%24323449%63%
2520
July1st to 10thDay
25%2432345%9%61%
2520
11th to 20thDay
24233235%5%9%62%
2368
21st to endDay
23133235%6%10%62%
2381
August1st to 10thDay
2313212348%69%
2149
11th to 20thDay
231221235%8%70%
2122
21st to endDay
231232345%8%68%
2376
September1st to 10thDay
231222335%9%68%
2160
11th to 20thDay
2313322448%68%
2007
21st to endDay
2313222347%71%
1980
October1st to 10thDay
5%42232335%8%64%
1980
11th to 20thDay
5%5%23323347%65%
1908
21st to endDay
431322345%7%68%
1931
November1st to 10thDay
331441335%8%64%
1674
11th to 20thDay
431342335%7%65%
1710
21st to endDay
6%32342445%9%60%
1710
December1st to 10thDay
7%5%243245%5%8%56%
1710
11th to 20thDay
11%6%25%5%3445%9%45%
2169
21st to endDay
10%7%36%6%45%5%6%8%40%
3146
January1st to 10thNight
8%5%24333448%57%
2457
11th to 20thNight
6%424324447%59%
2226
21st to endNight
9%5%24323336%61%
2376
February1st to 10thNight
7%5%24423345%61%
2160
11th to 20thNight
8%5%24333445%59%
2098
21st to endNight
10%6%24434346%54%
1776
March1st to 10thNight
8%6%25%6%25%45%9%49%
2160
11th to 20thNight
9%7%3442445%10%48%
2116
21st to endNight
7%7%2443445%8%54%
1987
April1st to 10thNight
10%6%445%34348%50%
1800
11th to 20thNight
7%7%24323345%59%
1779
21st to endNight
8%9%35%3245%5%7%51%
1800
May1st to 10thNight
8%12%35%43435%8%47%
1733
11th to 20thNight
8%13%46%4345%5%7%42%
1594
21st to endNight
9%11%35%434347%48%
1746
June1st to 10thNight
11%17%5%5%4345%48%35%
1620
11th to 20thNight
5%12%35%42445%10%45%
1561
21st to endNight
6%13%46%5%245%5%10%39%
1440
July1st to 10thNight
413%45%5%2447%9%45%
1440
11th to 20thNight
48%35%335%5%6%9%49%
1584
21st to endNight
48%3443447%10%49%
1934
August1st to 10thNight
46%243245%5%8%57%
1790
11th to 20thNight
27%243135%410%57%
1780
21st to endNight
36%25%32446%9%57%
1980
September1st to 10thNight
6%5%25%333446%59%
1800
11th to 20thNight
4423322447%65%
1952
21st to endNight
36%24313336%67%
1980
October1st to 10thNight
4423324446%65%
1980
11th to 20thNight
6%6%23313335%64%
2047
21st to endNight
5%5%14213347%65%
2425
November1st to 10thNight
4423423348%64%
2405
11th to 20thNight
3423422336%68%
2470
21st to endNight
5%5%345%2445%7%55%
2470
December1st to 10thNight
8%5%345%33447%54%
2470
11th to 20thNight
12%7%35%434446%47%
3041
21st to endNight
11%6%36%5%345%5%7%45%
4521

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
29%5%7%21%19%18%
1709
11th to 20thDay
26%47%15%23%25%
1768
21st to endDay
29%37%18%16%27%
1980
February1st to 10thDay
27%35%16%24%25%
1800
11th to 20thDay
24%36%19%27%21%
1760
21st to endDay
27%46%21%25%17%
1480
March1st to 10thDay
29%5%9%19%19%19%
1800
11th to 20thDay
25%410%24%23%14%
1844
21st to endDay
22%6%13%24%21%14%
2366
April1st to 10thDay
25%5%12%28%21%10%
2160
11th to 20thDay
21%5%7%24%25%17%
2132
21st to endDay
21%410%28%26%12%
2160
May1st to 10thDay
25%6%11%23%22%13%
2224
11th to 20thDay
24%48%27%26%11%
2304
21st to endDay
26%5%9%28%25%5%
2530
June1st to 10thDay
29%49%22%25%11%
2340
11th to 20thDay
20%45%16%32%23%
2390
21st to endDay
22%2313%26%35%
2520
July1st to 10thDay
20%25%13%26%34%
2451
11th to 20thDay
18%38%21%29%21%
2297
21st to endDay
18%410%26%28%14%
2249
August1st to 10thDay
16%1318%33%30%
2135
11th to 20thDay
14%2222%33%28%
2122
21st to endDay
15%3417%33%29%
2376
September1st to 10thDay
15%2413%35%30%
2160
11th to 20thDay
17%2314%34%30%
2007
21st to endDay
16%2417%34%27%
1980
October1st to 10thDay
21%35%21%23%28%
1980
11th to 20thDay
22%2419%24%29%
1908
21st to endDay
17%45%15%22%37%
1931
November1st to 10thDay
20%25%21%21%30%
1674
11th to 20thDay
20%38%16%20%34%
1710
21st to endDay
22%48%15%23%27%
1710
December1st to 10thDay
27%410%18%21%21%
1710
11th to 20thDay
38%5%9%15%19%14%
2168
21st to endDay
41%5%12%18%14%10%
3146
January1st to 10thNight
28%39%15%25%20%
2457
11th to 20thNight
26%37%15%19%30%
2226
21st to endNight
28%38%14%16%31%
2376
February1st to 10thNight
27%26%16%22%28%
2160
11th to 20thNight
29%45%16%21%25%
2099
21st to endNight
33%5%5%14%22%22%
1776
March1st to 10thNight
32%5%8%18%17%19%
2160
11th to 20thNight
33%48%18%21%15%
2116
21st to endNight
28%410%23%21%13%
1987
April1st to 10thNight
34%48%23%18%13%
1800
11th to 20thNight
27%47%21%23%18%
1779
21st to endNight
32%49%21%23%11%
1800
May1st to 10thNight
35%5%9%19%19%13%
1733
11th to 20thNight
40%47%20%17%11%
1595
21st to endNight
37%48%23%21%8%
1746
June1st to 10thNight
48%47%12%20%9%
1620
11th to 20thNight
34%4415%26%17%
1561
21st to endNight
38%3311%20%25%
1440
July1st to 10thNight
34%2313%19%28%
1400
11th to 20thNight
28%47%17%25%20%
1532
21st to endNight
28%310%23%24%11%
1827
August1st to 10thNight
25%3316%28%25%
1780
11th to 20thNight
24%2316%29%26%
1780
21st to endNight
23%2415%28%27%
1980
September1st to 10thNight
25%3311%30%28%
1800
11th to 20thNight
21%3311%29%33%
1952
21st to endNight
21%2313%34%28%
1980
October1st to 10thNight
20%36%19%24%28%
1980
11th to 20thNight
24%2416%24%30%
2047
21st to endNight
21%3312%23%38%
2425
November1st to 10thNight
21%45%17%21%34%
2405
11th to 20thNight
21%35%17%17%38%
2470
21st to endNight
27%47%16%17%29%
2470
December1st to 10thNight
31%37%15%19%25%
2470
11th to 20thNight
38%47%15%20%16%
3041
21st to endNight
37%6%11%20%14%12%
4521

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
14%6%16%37%23%4
270
11th to 20thDay
12%416%40%24%4
380
21st to endDay
9%7%23%34%23%4
462
February1st to 10thDay
10%5%19%33%25%7%
420
11th to 20thDay
8%8%26%34%21%2
415
21st to endDay
9%10%28%34%18%2
346
March1st to 10thDay
11%8%31%33%13%4
420
11th to 20thDay
9%7%24%35%22%3
420
21st to endDay
6%9%29%34%19%2
462
April1st to 10thDay
7%5%25%37%20%5%
420
11th to 20thDay
39%30%36%18%5%
412
21st to endDay
46%25%34%23%8%
420
May1st to 10thDay
6%5%25%34%23%6%
423
11th to 20thDay
6%6%18%43%23%6%
448
21st to endDay
8%7%20%38%22%5%
485
June1st to 10thDay
6%314%36%34%6%
450
11th to 20thDay
6%114%35%34%11%
450
21st to endDay
4210%33%41%10%
450
July1st to 10thDay
21431%49%13%
446
11th to 20thDay
3224%51%20%
444
21st to endDay
2231%46%19%
487
August1st to 10thDay
415%34%42%15%
447
11th to 20thDay
3429%46%17%
437
21st to endDay
3235%44%16%
495
September1st to 10thDay
316%43%35%12%
450
11th to 20thDay
2214%41%32%8%
450
21st to endDay
2116%38%32%11%
450
October1st to 10thDay
4317%39%31%7%
450
11th to 20thDay
6%216%38%29%9%
450
21st to endDay
5%416%35%30%11%
446
November1st to 10thDay
36%14%32%35%10%
270
11th to 20thDay
4214%40%30%10%
270
21st to endDay
5%5%19%37%25%9%
270
December1st to 10thDay
9%5%13%38%29%5%
270
11th to 20thDay
7%416%36%27%10%
270
21st to endDay
12%8%21%34%20%4
297
January1st to 10thNight
11%211%38%27%11%
760
11th to 20thNight
9%210%36%32%10%
728
21st to endNight
11%313%36%30%6%
792
February1st to 10thNight
9%210%36%32%12%
720
11th to 20thNight
10%213%37%29%9%
704
21st to endNight
12%412%40%27%5%
592
March1st to 10thNight
10%313%43%25%6%
720
11th to 20thNight
10%410%34%32%10%
720
21st to endNight
9%310%36%36%6%
792
April1st to 10thNight
12%37%38%34%6%
720
11th to 20thNight
8%411%36%32%9%
711
21st to endNight
9%48%31%39%9%
720
May1st to 10thNight
11%48%34%36%8%
653
11th to 20thNight
11%38%29%40%9%
531
21st to endNight
10%49%31%39%8%
584
June1st to 10thNight
14%39%30%36%8%
540
11th to 20thNight
8%25%27%49%9%
481
21st to endNight
12%1118%54%13%
360
July1st to 10thNight
9%137%52%27%
350
11th to 20thNight
5%28%54%30%
488
21st to endNight
5%128%53%30%
752
August1st to 10thNight
5%2213%54%25%
716
11th to 20thNight
5%118%52%33%
712
21st to endNight
5%1110%54%30%
792
September1st to 10thNight
7%1313%51%26%
720
11th to 20thNight
5%2219%55%17%
720
21st to endNight
41427%48%18%
720
October1st to 10thNight
5%2435%44%11%
720
11th to 20thNight
8%15%30%40%16%
720
21st to endNight
7%16%29%39%17%
792
November1st to 10thNight
5%27%32%39%15%
740
11th to 20thNight
415%36%39%15%
760
21st to endNight
6%39%39%32%11%
760
December1st to 10thNight
11%28%40%31%9%
760
11th to 20thNight
13%49%38%30%7%
760
21st to endNight
11%6%13%35%26%8%
836
Page generated at 2024-01-09 13:24:24. Version ac07

Copyright 2024 Attilla Danko


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